Correct, Eder, who also manufactured the 205 and 211’s which were the same machines but on tracks. R&R had one each of those as well. The current Cat ducks are still made in the old Eder factory and share sod all with the tracked machines. The old 212 and 206‘s that I operated in the ‘90’s shared frame, boom, stick, wheelbase, tyres, etc. The 212 had a 5 cyl air cooled Deutz and slightly higher hydraulic flow, and was quicker on its feet, the 206 had a 4 Cyl Deutz
All round, I‘d always pick doubles over super singles, if you get a blow out you still have a spare on each corner. In my experience, flotation is a non issue, as soon as mud jams up between the tyres you‘ve as good as got singles under you anyway.